package demo4;

import java.util.HashSet;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNextLine()) {
            String str1 = in.nextLine();
            String str2 = in.nextLine();

            func(str1,str2);


        }
    }
    public static void func(String str1,  String str2){
        HashSet<Character> set1 = new HashSet<>();
        HashSet<Character> setBroken = new HashSet<>();

        for(char ch : str2.toUpperCase().toCharArray()){
            set1.add(ch);
        }
        for(char ch : str1.toUpperCase().toCharArray()){
            if(!set1.contains(ch) && !setBroken.contains(ch)){
                System.out.print(ch);
                setBroken.add(ch);
            }
        }


    }
}
